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Hi dusty.............ytong are autoclaved aerated concrete blocks. I've used them in my house build. 9"/150mm for exterior and 4"/100mm for internal walls and my nephew Richard is building a complete house with them. Kind of like a large lego set. They are lightweight and can be cut with a handsaw. I can post some photos if you are interested. I think Carl from England used them for insulation under his hearth. I also seem to remember that he did some heat tests on them. I'll see if I can find the thread.

Hello again,

couple of years ago I built a large shed (56 sq m) from AAC blocks. In our region they come 200 mm wide. Laid up fairly quickly on special mortar but VERY fragile given the right WRONG conditions - see my album the shed at Picasa Web Albums - carioca...

I would NOT use them for insulation near a WFO - there exist special lightweight heat-proof insulation blocks for that purpose.

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